Look at the tags tab, not the releases tab.

https://github.com/anomalyco/opencode/tags

If you use Nix it's a flake so super easy to run too.

Seconded that v2 has much better background shell + subagent management: it's now much more eager to appropriately spawn either of them on its own, and does so in a way that is asynchronous, i.e it doesn't block the conversation and you can examine them by pressing down arrow at the prompt box.